Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4398bf4b89f1c4…

MALICIOUS

PDF

87.0 KB Created: 2021-06-27 04:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b54ce7ac9b40749fc3842bb8758cd101 SHA-1: c7eec9d1a3aad42e6380a076b9d081fc8b38afea SHA-256: 5b4398bf4b89f1c4e2bb537c88527fbd137f64d0fc58a659de0b638f52c818ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous URLs points to an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/uplcv?utm_term=walking+with+dinosaurs+3d
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078f60d709bf---luxuvelopulinawofizoze.pdf
    • http://analogsys.com/uploaded/file/164986199960be10c5d1f80.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/bfaa07b006f22293b9ee21c883d10d06/kujamarozagopokojebab.pdf
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd9c6ccf23---xevegusade.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb4c909a8d---zelokonolekifufiderid.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aed2ab94693---3851801348.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/7tb206v9uf86vp08fmuchbk9ug/88994224288.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/a9420c2bfaf2d581e98aacc58d658d06/vugevuwigaredakivux.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17be996180---lawape.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/8a6890e77f383ee2bc62b3201fae326f/94099350000.pdf
    • https://hotel-la-licorne.fr/userfiles/file/niwagapopirugelurarokuf.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/ad521bdd7df48418a17633db58ef6791/kepuwupej.pdf
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/91142991663.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/236d5639eeddcbb4d46e663e1aff2a26/41457465918.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/bukuzujunef.pdf
    • http://turnyras.lt/Files/file/52783407864.pdf
    • http://abw10thstreetne.com/uploads/files/lawolijufu.pdf
    • http://jncs.kr/page_data/file/20210526025157.pdf
    • http://duonglaohanoi.com/userfiles/file/70636387252.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608624cd34479---waxekuzovu.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/3440c96db83557c31d432368d24f15b8/kilotugosokupepaf.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc6239bf02---3053637040.pdf
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/59015704525.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeaf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAF 16792 bytes
font_01_sfnt_off000106c6.bin
ddf28b549a06aad8fda233f9a1630926053c2d8055f35fbc03cb39fe591690ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x106C6 10840 bytes
font_02_sfnt_off00011f93.bin
b3b6da56926f99a3cb6ad3b433cc38ca157a172e57760f8c41aea3307527c7c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F93 17992 bytes